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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7d46d6a88d78ce3d74d7bac531a5970730dcfc3a52353a1b72638b20b7f4cfde' 
  AND token = 'eIXyeN4GQPh7FlNY4ZM2pCr4YOX3FdRmSf+33Dg/kPs=' 
  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"
    }
  }
}