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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2dbd27ce7ee8e82f1d83d7f1477d2da56947b73a8dbb545b2acb81393e9a88d' 
  AND token = 'GJMxu0v4Ab1UEASOj+NCIZwHPUjxCbVGwd81+BS8Hi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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