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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f677cdd91d1316c2c4a3694a58898dc1d7180c5d3e8f659df5d7ad91da2b9e8' 
  AND token = '1bpwIUr973/Gk9vJnLcVd1VssaNsOxrszbKkV07ECLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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