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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cc72e8ec2724c0f2c7a3e61294668a913d3facf1c387c0da3905cf52f98923' 
  AND token = 'Vda67GyAKTIr+2wqjrh+11b7+QMMn8DPOcrCQ851u74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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