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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26e17075e410094d8214184e0a23b5c53b2c78878016a2db718648f533ee7af' 
  AND token = 'rmS2DMbahNFOud6W7fU/L+TmGIqRGldBdbf3z8ZFZEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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