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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfcf1e681d6f0f9e9841380cc683490c8873227084f0b9c17982bf05fad2777f' 
  AND token = 'eviN1J8T7lAUF4py3menD5MYpupsp0Xd3ysXr73Ycq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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