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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f1b708af87dd8a1f31882bae0249e13e576e2304d79011a9790c86e7bd3601' 
  AND token = 'lxaP7YYxjyP4GoMOYmulTTO/+sLAtg6JLh2GhPPM2xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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