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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b863dba131e0ee43731a5db7e438cb3d9ce63c5aeeaf241aff4d17b36ef85cb8' 
  AND token = 'f1r7Yfvrodhc9mZ3+hIHsK5CEK+Iq2WYCqlHN3iurVk=' 
  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"
    }
  }
}