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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d128f0b5ef9d06bb355dc3cac6e36573cfa6bcfd3c54499e57b3b95e79b9780' 
  AND token = 'b5Ko58mnf6PUyu0usT+6dxgjke+zUsQYS+4y17NSUOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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