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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5cfaecf01c2a31ecb054ff2e9b156ce413240875d3926e2aa00a10468e1dac7' 
  AND token = 'uyXa/IL3Ul2HGu9KMI9Q787rXfr14H83RTkkItfV0sI=' 
  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"
    }
  }
}