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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7656789658bb7a5b64f6c917baa8c7623dc7bda89796f67611f846104a29f71e' 
  AND token = 'fO7L46OXhHdRhWTLMSvbjkFnYwxzWZ/KoL5lnXVT1IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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