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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e825b61bcb5786d83620aea822b374c889a7e1302ea33a092b18678d0904b49a' 
  AND token = 'E+OZ5VcN/xkj0gThgrK0Okdpm3hO6DVaz2VSmhl6PnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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