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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f72862d4e9f56da676a450a719e517b6c7c7ae5f073685cd11745f507f8f6c' 
  AND token = 'TIR32m7Jmfc1FP312oSLueI+pCd8YwCu37ftDhqfkW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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