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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960c0de65764302989c6a86ac9772e0b488fd7aea3325a32064e8cf73c3883cc' 
  AND token = 'nI/32Tznq47+nQ8V25/0DE9d4/b17XR+R7ekTi+dCtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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