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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a663cc047f8b5d3f01b835e54b7668eae0e5cb5855efc5d5768e8232c5479bac' 
  AND token = '2+PkjIa0g97OHA0f/yQizGxEM1NGCu5xpMm3dr0b/iM=' 
  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"
    }
  }
}