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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af2bcb76b9fcb0845c0831dcffeb8f2f5260c611c289170e8e2d526480d10b01' 
  AND token = 'KX+5uklmQv6jMoqm+fN2aV8Is94G4FS9XPdshFkzP14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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