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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c74998422fd8d934f3510b4bb8e15c9daac00db2a51d7b7313a54e91d86ea67f' 
  AND token = 'c2UTm7GrSs2G8jtlmsI9gFkKQPsa1M8HQ4Jr3iwy7Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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