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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4760e37e585e6e7b6a3d60d4eee59480870167f197bb6820c9ca9375a1813407' 
  AND token = '4AOxmxSEBSFoG88NAwLpSOq+RGwE9+1JEGn70JYX+q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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