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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6a948d2fd4cefae4518876c1d0fc0b89dad819beda43b49dbd9407f0150c2f16' 
  AND token = 'M4J6NFd0tMf3mahJyS3AxWq0+gBFYoVAi1EJeZZXWyI=' 
  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"
    }
  }
}