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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07116f9063395e07c7dad065b7b86d3ad36f4fd38a13941f2f9e3dbe030e607' 
  AND token = 'yKnxAzoq1fYRZariFEySCcK8cnBY572nykWw1A3YL0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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