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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12117332345d445ac083bba3ba915ec6ef70b5b5b215a7205a2415c8bcd43dfb' 
  AND token = 'L41uUM0a2/rgwWYNOliLGhXFNPshAlVwLENtk2wF2Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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