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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5977a44773c5ff902235172ddfe26eb420cb31941fb6a96c17a74d02b5d15df6' 
  AND token = 'xi7UgA4VPDVMKQitEdMVuHVVYOfXUGSnR8n9Z27cIhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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