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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf899d6952d119e5f06735f0bed5db76d81ee9b06121b42406dba1fae93dcee3' 
  AND token = 'b8SI6CQ/z7iLHCnY4NtuNm94p+x4F3chpAhBe+TWAYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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