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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '0983a351c261c1f18fee46afb68d15d892c7d04652ea750391fff43fa1a066b5' 
  AND token = 'JkeBjmHcnlyq8Sbscl3rTr8NFvcSsKUlYqRZk6/adqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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