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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e709c141b4a650348901ccfee43493f2bfe9c59d75eaa306fe1c4f5a57a15952' 
  AND token = 'i4oDf21b/4o/UED3vNKPz1qaYRZLEanjCFtGeoiLi4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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