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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec41126afc1125e128c091bd06fdd27637684a3a9fe32102e9dc0a2aff5f5b7' 
  AND token = 'lfXPNukalaaA65CN88KXmmdhM7SeFK6auau4FCl6CTk=' 
  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"
    }
  }
}