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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6e10b8103c4ee493040ab629dc8bd55b6a0d1942b9997f7bc6c540fffaba9f' 
  AND token = 'Xw55SBgwZ7PzKga/f/NAWtk4UECeHRw9LUWefyHLTXY=' 
  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"
    }
  }
}