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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '79bda2a6ac2da5d56b3d13ab307de00f4a9f6ee510918805c7aa3ce87f1b51a8' 
  AND token = 'MUb8jbSVtxzEp+LEiAU9kZFTfKEyaaJHXk4fCooVEcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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