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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9064e9b7924be7c8c4bf89c6d508d4909f89e81270c0f9cb7f85b952aa68898' 
  AND token = 'wJyBiqWX6n8BP5IP64JLgTq+xukodsh14z1Bnk0TEcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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