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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37884be570f7b91f9400fc50d159858c3d13c614641a27f9cd5e95870c285bd2' 
  AND token = 'i6b4CP5Xfgxtg+OMsHaojXPgAZyQ9V9pAGS0titVb7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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