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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987ace3003bc955b1399c009944739c03b80d10a01ccc643f0ccf1b1c8676c1b' 
  AND token = 'ltjqOjEO1CAN2KyevKnS64QCCEVyLDbd9BCSfmsuJ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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