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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '438f2af8651f3dd7f91c535203b6c539918896084b83e88cac930a26031b8921' 
  AND token = '7ogyx17Wso33CFxpNPTeAfiRZIhcs/dpUaz3mimfiVA=' 
  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"
    }
  }
}