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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cd4e519a844f5ede443a39d5ecbf1ebf94ab7654970145cc837661e5303927' 
  AND token = 'w/RW/GYq/NQg7TAj3si1EIhRawjwH9fS/FCq6tnJCiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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