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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b217c09743eed83023fece6f3c269b41b63e565f1b17592f65ad22c0dc7ec3' 
  AND token = 'qPOaIiee4nBeImLPP1H6kxasW3aYftUyYjo2F5iDSfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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