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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326bf9e64f00d14ee52110ffaa267f6d101fcd7023b5cca65602330d3a7e24e7' 
  AND token = 'xaowqaPWSsEUR0I53lj+BWspz10/KX4MpOZBGTofN4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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