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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e05056c52b0a9abefc71f5913361ac17ea716b78e27b2718bec73499676c5b4' 
  AND token = 'EdBHWshXL9bIvZSVbJ4um4Bjm/Fas4Pw5vAEDLoo3bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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