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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9391f4201849f43db1acede9bf80c0d3e99761c6173e3631f574d9515ee7861c' 
  AND token = 'aNwlHXStY2K8HlWQyY8xp8u69Ci3DuG4MC+OOEW4i44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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