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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e938b2bceb213fbf901f3ebd7f237d82d3d1d4b9fbe96f6ac3410b0b440c72a' 
  AND token = 'D71mFkllu390JCj/xGZ2iVpLqKF/Nv9DtSo3Aeh+c/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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