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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3591a3959be8159d22841fc30295b6a6b42107089c3f77c4ef3f5c1d52c4d00' 
  AND token = 'GDXaP7xdkHngmRHC541yOGqG7celPl6S4n8VamhAfyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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