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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ef144f41686ae5c51c09bd311f4b0a8f83ce64918ce5d444897a550e84e3ca' 
  AND token = 'JwN6Pyq0Itvehcj9MBWCX6JAZcDLsLmheif3VG2SsMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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