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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '40f70527e4bdbb2f42a86a171124618e242e5fcd24f18201bbe637037b36f63a' 
  AND token = 'eWQ4e+d7zuXKIgUx13rfICjmc7parLhOIjJ0V9eIKPQ=' 
  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"
    }
  }
}