SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4fe2f81f293b9c85f5e196b5c1c195143b764b9fdd521b32efeba243602e016' 
  AND token = 'yB2ZZ+OH0eT1Hi+5cdPzGkhPpzOhK3FLhnJvHCHvgfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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