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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6a70eb5d4201da508e0151b3c7e3fc1349f8f5b2a7de71446e514cddcd83b51f' 
  AND token = 'wd76MIx7JgN5j8dPaG2MulUkoIqz9d1t7h1GrjPqNFE=' 
  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"
    }
  }
}