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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31d64d54bbb35230223f167a42db34bc613f56c5ccb1c56494e29c47c7797fb' 
  AND token = '8/y3BZVieupqIWiL3uHklB50G67y4CIz2d66/bXdWqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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