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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd98a01ec977a9368d88b1c541c4bd6cf92cac6640bd988d51b4a9f2354faf7' 
  AND token = 'epFoU71SUeB0wP7eL3dKDqR7V7JEb9JirTPhu4Cwuos=' 
  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"
    }
  }
}