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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '654afc7187afe19a0dd3f41c0a85926ed1c2397e714271b9e18db637e46e3f43' 
  AND token = 'C8em3k5bnPq8KBXvsIZ1F2bis6hGRfdau88lhRngCjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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