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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e025e0e430d74c01b69414f0230c31c756b6a37ca970d56632838d18fb7db1' 
  AND token = 'rxEjpPFzP5V5iRvFI0NQI5FF8BFmq+HZB1J7NQwoBeo=' 
  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"
    }
  }
}