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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ecf90a8f0eac48971bfb9abec697a8716a4be343a240c926fa0013d20b2b0b8' 
  AND token = '842x7eEk4QSydyI3Iag5WMwRZ8FmdVnlxPc4297h1ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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