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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6821716d748cc6d8f28993c0a5158eb19745be5b3145939e1e84e3fc24f53f2c' 
  AND token = 'kpOEhEZrzx86qvkaDS/G6gUc5jac7SUuCr05wXRTRHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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