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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d223653dbeb44aebe5b0b5b8a51f555d7b32f3cdef5827f453d4e6b09000d9' 
  AND token = 'cS7M00W15VyZJ9cBzfMP+oe1qPxcdgUoCpZn3b+wu3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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