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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8cb88ad67a26fa4259fc54c835d4fa3433dbb3247806cc02a4e243ad4fee146' 
  AND token = 'aYoEgU9xIBT2LqUB6zO10rGIEiKZaZ7gHAnwNFP6hSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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