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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '740b6daa0341c8df5f0ccdd8faa56844a1aeb2994c222b3e7b3bede284ae0c50' 
  AND token = 'XS2UKu2LEu2kj3FeyXoCzoRh3B/p7w7VE0GeO99yB6E=' 
  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"
    }
  }
}