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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '52bc37ca0834a95e80e9ff345bad279018aa8249d31b62a631be6205e5816cb5' 
  AND token = '9We3Iw3cP1fY3dP4ogH71ud1FMioWCpbf9CocRb+rJ0=' 
  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"
    }
  }
}