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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'dc8fb4b394dbf219a3acff607abfabda2ee8475c418f5b1ec52365277c77e665' 
  AND token = '4A15yKs8HWFcoB2Rg1Q8mUZfGes1rgP1oKq4rN4BaEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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