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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcaf238584cec90339567b8b7d5efefe63598cfb925e9d36cbc70bb6a26c99e7' 
  AND token = 'HiijnmeOpVXcHxXvwWUD+DiqFi4XQm+117DgeWy54TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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