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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e477d077c1e4c2ac13630da3244f9bafd7b45f7330184078fb0025d2e891e0' 
  AND token = 'Jsjp6wmrAUKsYqgcyAuLu/omfYJJkitpQ1pJgAsiULw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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