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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934e503541622ba0f19cfae004ea574cede3c1f715bcd610fd404d1e7a35d2ad' 
  AND token = 'snithw5cWBMhsHSD+5xZlt7wf2Wy/6vpJ9iVHa2slmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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