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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81b663a712ed66947da7d9852bb785cfb44c78d84c3444afb8ad8eebc6741597' 
  AND token = 'Bw17bwhSVgaIo4co7yek8W6jKBPhuoWoxGRMzfbPCC8=' 
  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"
    }
  }
}