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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475dee7b849b0577d21ca8ad123b353ec66b8dc947e5664dca2742496dacb42f' 
  AND token = 'ob1QR/FfWcY4/cEvfmeBc4C37A4JLCLnZb793mU6Ng0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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