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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ddce2964ea1ac0208d27cdfb28b5ba9b65f8cbafbf31a34208a5ad7ad9a088' 
  AND token = 'tkCe4c2GABiT0MfKQsN0RmJDRmdK7htytqevno1VzRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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