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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a51a39bba699e9e1dada974c08e82168b710c138e1f432ec985ff142fbb3972' 
  AND token = 'pC8m5yu3rAEGtoZ1gN2lW8Kr3lyStlrU5FpM5Z5AJBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}