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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '74c40e63f90e57aecd13fe6683ed6d1b8f007b663a7b0af5c73d7711796ca284' 
  AND token = '4DzAhEEd0hWnLOUccuXc/A4CU8e0HH4EqVecpCOioAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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