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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1d6ac8fdacd36c0d0b2f7e258bd74a02e734cb4ecb41648afeff7b35afb0f4' 
  AND token = 'psmRT053ipr7fQ5g1PT88TZZUIwaC7rJA9a7mURALkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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