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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c032fea17063cc0c17c2e102ad24bbf2d1f98f92eadc0ecf226c6cc4c201b76b' 
  AND token = '43349ykUoA3OMm3C4zd79sHPCI2d0FcNT2fCeoNL8PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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