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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb761b8e216ed444b2c88773f8097394e76462012fbe9f10e34bb2eeb1bb40fb' 
  AND token = 'ra3c834bKNEGJa8NfM9YZvbjTqYjNX5zbXH29UnP4Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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