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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b37ff1a3f8261c53517cb1802f2b665a5617eff23fd9ee0d0f11b0634fc04c' 
  AND token = '8mbkavsox5hjHm8f3HTESs/3Qk7dhMecCB5qZswoVWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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