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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a15a06af597c3f3d6969b0da06ce6c2b60d70b054c62a53189307e3fc23716' 
  AND token = '1QKyFseiX7GKMUxv1B97lf+cdsZVBfcZJ6e7jsV0Q68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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