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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a683d2527cfd2f9ede8c45b85af27670f2feba59dc86c4d00d5d3b9342af549c' 
  AND token = 'rjSMF9y48U6w6BRuUuX0O+rLMlYWZfskksoxOJDK4XE=' 
  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"
    }
  }
}